Beginning in May, 2013, and at other times thereafter, members of the senior management team of Arch Coal, Inc. (the Company), will use the attached slides in various investor presentations. The slides from the presentation are attached as Exhibit 99.1 hereto and are hereby incorporated by reference.

The information contained in Item 7.01 and the exhibits attached hereto shall not be deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the Exchange Act), or otherwise subject to the liabilities of that section, nor shall they be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the Securities Act) or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01Financial Statements and Exhibits.

(d)Exhibits

The following exhibits are attached hereto and filed herewith.

Exhibit No.

Description

99.1

Arch Coal, Inc. Investor Presentation Slides

2

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: May 8, 2013

Arch Coal, Inc.

By:

/s/ Robert G. Jones

Robert G. Jones

Senior Vice President  Law, General Counsel and Secretary

3

Exhibit Index

Exhibit No.

Description

99.1

Arch Coal, Inc. Investor Presentation Slides

4

EX-99.1
2
a13-11716_1ex99d1.htm
EX-99.1

Exhibit
99.1

Arch Coal, Inc.
Investor Presentation May 2013

Slide 2
Forward-Looking Information This presentation contains forward-looking
statements  that is, statements related to future, not past, events. In
this context, forward-looking statements often address our expected future
business and financial performance, and often contain words such as
expects, anticipates, intends, plans, believes, seeks, or will.
Forward-looking statements by their nature address matters that are, to
different degrees, uncertain. For us, particular uncertainties arise from
changes in the demand for our coal by the domestic electric generation
industry; from legislation and regulations relating to the Clean Air Act and
other environmental initiatives; from operational, geological, permit, labor
and weather-related factors; from fluctuations in the amount of cash we
generate from operations; from future integration of acquired businesses; and
from numerous other matters of national, regional and global scale, including
those of a political, economic, business, competitive or regulatory nature.
These uncertainties may cause our actual future results to be materially
different than those expressed in our forward-looking statements. We do not
undertake to update our forward-looking statements, whether as a result of
new information, future events or otherwise, except as may be required by
law. For a description of some of the risks and uncertainties that may affect
our future results, you should see the risk factors described from time to
time in the reports we file with the Securities and Exchange Commission.

Arch is among
the top coal producers and marketers in the world Slide 3 Sources: ACI, MSHA,
Ventyx, company filings, press articles * Pro forma Top 10 Global Coal
Producers (2012, in millions of metric tonnes) Government affiliated Arch is
one of the largest coal producers globally, and is the third largest
private-sector producer based on volume.

Arch is the
most diversified U.S. coal producer, and the No. 2 reserve holder in the
nation Operations extend to every major coal supply basin Slide 4 5.5 Billion
Ton Reserve Base Western Bituminous Region 409 million tons of reserves
Illinois Basin 725 million tons of reserves Powder River Basin 3,309 million
tons of reserves Appalachia 1,047 430 Met/PCI million tons of reserves

Arch has a
leading, low-cost western thermal portfolio with meaningful available
capacity Arch has a strong position in the PRB, the nations largest coal
supply basin High-Btu, low-sulfur product Available, excess capacity to bring
back as demand returns Expect PRB to expand domestically Pursuing export
growth off West Coast Arch is the leading producer in the Western Bituminous
Region Supply to remain constrained in region Targeting exports via Gulf/West
Coast Slide 7 Sources: ACI, MSHA Western Bituminous Region (2012 production,
in millions of tons) Southern Powder River Basin (2012 production, in
millions of tons)

Archs thermal
platform in the Illinois Basin provides future opportunities Viper Mine is
low-cost and highly competitive Arch owns a 49% equity stake in Knight Hawk,
which sold over 4 million tons in 2012 Arch has built a large portfolio of
low-chlorine assets in the basin All required permits received for the Lost
Prairie Reserves, setting the stage for potential development in the future
Slide 8 Sources: ACI, Ventyx *49% equity interest Legacy Arch Assets Former ICG
Assets River Docks ACI Headquarters Illinois Basin Viper Mine Lost Prairie
Reserves Knight Hawk* Macoupin Reserves 725 Million tons of reserves

Slide 11 Arch
continues to advance development of the Leer mine to build out its
metallurgical coal franchise Preparation plant is online Continuous miners
are in operation First train loaded in fall of 2012 Longwall expected to
start-up by October 2013 Cash costs expected within Archs current cost range
or lower High-vol A Leer mine should improve company margins Prep Plant &
Train Loadout

Arch is
well-positioned to benefit as coal markets improve Archs diversified
operations, competitive cost structure and enhanced liquidity position will
allow it to emerge as an even stronger player as the market returns to a more
balanced state Slide 16 Flexible Capital Structure Current Focus Manage
capital Control costs Rationalize supply Continue met development Maximize
value of asset base As Cycle Turns Reduce leverage Invest in the business via
organic and strategic growth Return capital to stakeholders Maximize value of
asset base

U.S. coal
stockpiles should further liquidate in 2013; could end the year at targeted
levels Slide 19 Sources: EIA, EVA and ACI After a record build in May 2012,
coal stockpiles at U.S. generators declined to 185 million tons by December.
Despite the positive trend, stockpiles remained well above targeted levels.
With higher natural gas prices, normalized weather, elevated exports and
lower supply anticipated in 2013, we expect coal stockpiles to liquidate
further and approach targeted levels by year end. Estimated Coal Stockpile
Levels at U.S. Power Generators (in millions of tons, at December 31) 140-150
million ton customer target

As natural gas
prices rise, Powder River Basin coal is moving back into the money Slide 21
Powder River Basin vs. Natural Gas (in millions of tons of coal displaced per
mm Btu gas prices) 25+ Million Tons should be recaptured by the PRB in 2013
We estimate that ~30 million tons of PRB coal consumption was displaced by
natural gas in 2012 We expect domestic consumption of Western Bituminous coal
to increase by 8 million tons due to higher natural gas prices Central
Appalachia will start to become competitive if and when gas prices move above
$4.50 $2 $4 Price assumptions per ton: PRB: $11. Transportation costs per
ton: $20-$25. Heat rate assumptions: single cycle gas: 11,000, combined cycle
gas: 7,000, PRB coal plant: 10,000.

Slide 22 Arch
expects 30% of U.S. coal-fueled units to retire by 2018, but the impact on
consumption wont be as great Source: Ventyx, ACI Likely to Continue Likely
to Retire Retired Number of units Installed capacity Coal consumption in 2012

The coal fleet
has run at much higher utilization rates in past Large plants retrofitted
with modern control technologies should be able to operate at capacity
factors well above the 2007 fleet average The units that we anticipate
surviving the current shake-out operated at approximately 60% utilization in
2012, according to our estimates Slide 23 Sources: Wood Mackenzie and ACI
Average Capacity Factor of U.S. Coal Fleet 112 123 156 131 142 77 73% 54%
Coal units are operating at low capacity factors, which could provide offset
to the impact of plant retirements

The U.S.
already plays a sizable and increasingly essential role in global
metallurgical markets Slide 29 Sources: Wood Mackenzie, T. Parker Host and
ACI 2012 Metallurgical Export Coal Supply (in millions of metric tonnes)
Low-Vol Mid-Vol High-Vol The U.S. is already an essential source of seaborne
metallurgical coal  second only to Australia U.S. output of low-vol and
mid-vol coals is comparable to Canada

Slide 31 The
trend of increased coal imports is unmistakable  and the growth is not
confined to India and China Sources: ACI, McCloskey, India Coal Market Watch
Data, Bloomberg, JP Morgan / Bangkok Post China net imports (in millions of
metric tonnes) India net imports (in millions of metric tonnes) 20 133 (63)
223 Since 2007, South Korean imports have risen 45% to 141 million tonnes
Vietnam plans to add more than 30 GWs of coal-based capacity this decade 
and Taiwan, Indonesia, Malaysia and the Philippines are following a similar
path Thailands energy agency expects power demand to double by 2030, and
views coal as a lower cost and more secure option than LNG Thermal Met
Thermal Met

European coal
consumption has risen measurably With natural gas prices at nearly three
times the level prevailing in the U.S., Europe is consuming more coal
Expiring natural gas contracts as well as an acrimonious history of natural
gas purchases from Russia provide further incentives Declining indigenous
production in Europe should translate into increased coal imports 6 GW of new
coal-fueled capacity coming online on the continent in 2013 Slide 32 Sources:
IEA, IHS CERA, McCloskey and ACI *Excludes consumption of brown coal Coal
Burn in the European Union (in millions of tonnes of coal equivalent)* 2010
2011 2012

China is
depleting reserves at an unprecedented (and accelerating) rate and production
is migrating further from population centers. Imported coal often offers
significant quality and environmental advantages. Australia will experience
higher costs in new reserve areas. Government, regulatory and community
impediments are on the rise. Supply Pressures Traditional supply sources are
faced with rising costs, depleting resources and growing domestic demand,
making U.S. coal increasingly competitive Slide 33 Source: Public sources
India faces quality, land use, environmental and infrastructure challenges.
Other Supply Regions South Africa is increasingly mature and infrastructure
needs are great. Russia faces reserve depletion in the West and
infrastructure needs in the East. Mongolia and Mozambique have coal but no
roads, rail, ports or miners. Indonesia coal quality is declining and
infrastructure is a huge challenge. Substantial capital is required to open
new reserve areas, and growing domestic demand could ultimately constrain
export growth.

Slide 35 While
current market conditions are challenging, long-term prospects for coal
demand are bright CURRENT MARKET Global macro uncertainty is impacting both
thermal and met demand Emerging markets have slowed in the face of economic
weakness in the developed world Utilization rates at global steel mills stand
at 79 percent  off peak levels Thermal and met coal prices have slid to
unsustainably low levels Sources: World Steel Association, Wood Mackenzie,
ACI and other public sources LONG-TERM World steel consumption is projected
to climb +40% by 2020 World population could top 8 billion by 2030  with
substantial urbanization and growth in middle class of emerging world The
rapid build-out of the worlds coal-based power plant fleet shows no signs of
abating Growing supply constraints should further support market conditions